ICD-10-CM > S00-T88 > T20-T25 > T25 > T25.4 > T25.49 T25.49 Corrosion of unspecified degree of multiple sites of ankle and foot Non-Billable/Non-Specific Codes T25.491Corrosion of unspecified degree of multiple sites of right ankle and footT25.491A..., initial encounterT25.491D..., subsequent encounterT25.491S..., sequelaT25.492Corrosion of unspecified degree of multiple sites of left ankle and footT25.492A..., initial encounterT25.492D..., subsequent encounterT25.492S..., sequelaT25.499Corrosion of unspecified degree of multiple sites of unspecified ankle and footT25.499A..., initial encounterT25.499D..., subsequent encounterT25.499S..., sequela